path: root/src/gui/fpg_grid.pas

{
    fpGUI  -  Free Pascal GUI Toolkit

    Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
    distribution, for details of the copyright.

    See the file COPYING.modifiedLGPL, included in this distribution,
    for details about redistributing fpGUI.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    Description:
      Defines a File Grid and String Grid. Both are decendants of Custom Grid.
}

unit fpg_grid;

{$mode objfpc}{$H+}

{
  TODO:
    * TCustomStringGrid: Col[] and Row[] properties need to be implemented,
      returning a TStrings with all related text inserted.
    * File Grid: Introduce support for images based on file types. User must
      be able to override the default images with their own.
    * Remove the usage of libc unit. libc is linux/x86 specific.
}

interface

uses
  Classes,
  SysUtils,
  fpg_base,
  fpg_main,
  fpg_basegrid,
  fpg_customgrid;
  
type

  TfpgFileGrid = class(TfpgCustomGrid)
  private
    FFileList: TfpgFileList;
    FFixedFont: TfpgFont;
  protected
    function    GetRowCount: Integer; override;
    procedure   DrawCell(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor  Destroy; override;
    function    CurrentEntry: TFileEntry;
    property    FixedFont: TfpgFont read FFixedFont;
    property    FileList: TfpgFileList read FFileList;
    property    DefaultRowHeight;
    property    Font;
    property    HeaderFont;
  published
    property    FontDesc;
    property    HeaderFontDesc;
    property    RowCount;
    property    ColumnCount;
    property    Columns;
    property    FocusRow;
    property    ScrollBarStyle;
    property    TabOrder;
    property    OnRowChange;
    property    OnDoubleClick;
  end;


  TfpgStringColumn = class(TfpgGridColumn)
  private
    FCells: TStringList;
  public
	  constructor Create; override;
	  destructor  Destroy; override;
    property    Cells: TStringList read FCells write FCells;
  end;


  { TfpgCustomStringGrid }

  TfpgCustomStringGrid = class(TfpgCustomGrid)
  private
    function    GetCell(ACol, ARow: Integer): string;
    function    GetColumnAlignment(ACol: Integer): TAlignment;
    function    GetColumnTitle(ACol: Integer): string;
    function    GetObjects(ACol, ARow: Integer): TObject;
    procedure   SetCell(ACol, ARow: Integer; const AValue: string);
    procedure   SetColumnAlignment(ACol: Integer; const AValue: TAlignment);
    procedure   SetColumnTitle(ACol: Integer; const AValue: string);
    procedure   SetObjects(ACol, ARow: Integer; const AValue: TObject);
  protected
    function    GetColumnWidth(ACol: Integer): integer; override;
    procedure   SetColumnWidth(ACol: Integer; const AValue: integer); override;
    function    GetColumns(AIndex: Integer): TfpgStringColumn; reintroduce;
    procedure   DoDeleteColumn(ACol: integer); override;
    procedure   DoSetRowCount(AValue: integer); override;
    procedure   DoAfterAddColumn(ACol: integer); override;
    function    DoCreateColumnClass: TfpgStringColumn; reintroduce; override;
    procedure   DrawCell(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState); override;
    property    Columns[AIndex: Integer]: TfpgStringColumn read GetColumns;
  public
    constructor Create(AOwner: TComponent); override;
    function    AddColumn(ATitle: string; AWidth: integer; AAlignment: TAlignment = taLeftJustify;
        AbackgroundColor: TfpgColor = clDefault; ATextColor: TfpgColor = clDefault): TfpgStringColumn; overload;
    procedure   DeleteRow(AIndex: integer); override;
    property    Cells[ACol, ARow: Integer]: string read GetCell write SetCell;
    property    Objects[ACol, ARow: Integer]: TObject read GetObjects write SetObjects;
    property    ColumnTitle[ACol: Integer]: string read GetColumnTitle write SetColumnTitle;
    property    ColumnWidth[ACol: Integer]: integer read GetColumnWidth write SetColumnWidth;
    property    ColumnAlignment[ACol: Integer]: TAlignment read GetColumnAlignment write SetColumnAlignment;
    property    ColumnBackgroundColor;
    property    ColumnTextColor;
//    property    Cols[index: Integer]: TStrings read GetCols write SetCols;
//    property    Rows[index: Integer]: TStrings read GetRows write SetRows;
  end;


  TfpgStringGrid = class(TfpgCustomStringGrid)
  published
    property    BackgroundColor;
//    property    ColResizing;
    property    ColumnCount;
    property    Columns;
    property    ColumnWidth;
    property    DefaultColWidth;
    property    DefaultRowHeight;
    property    FocusCol;
    property    FocusRow;
    property    FontDesc;
    property    HeaderFontDesc;
    property    HeaderHeight;
    property    Options;
    property    ParentShowHint;
    property    RowCount;
    property    RowSelect;
    property    ScrollBarStyle;
    property    ShowGrid;
    property    ShowHeader;
    property    ShowHint;
    property    TabOrder;
    property    TopRow;
    property    VisibleRows;
    property    OnCanSelectCell;
    property    OnDrawCell;
    property    OnDoubleClick;
    property    OnFocusChange;
    property    OnKeyPress;
    property    OnRowChange;
  end;

function CreateStringGrid(AOwner: TComponent; x, y, w, h: TfpgCoord; AColumnCount: integer = 0): TfpgStringGrid;


implementation

uses
  fpg_constants;

function CreateStringGrid(AOwner: TComponent; x, y, w, h: TfpgCoord; AColumnCount: integer = 0): TfpgStringGrid;
begin
  Result  := TfpgStringGrid.Create(AOwner);
  Result.Left         := x;
  Result.Top          := y;
  Result.Width        := w;
  Result.Height       := h;
  Result.ColumnCount  := AColumnCount;
end;

{ TfpgFileGrid }

function TfpgFileGrid.GetRowCount: Integer;
begin
  Result := FFileList.Count;
end;

procedure TfpgFileGrid.DrawCell(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState);
const
  picture_width = 20;
var
  e: TFileEntry;
  x: integer;
  y: integer;
  s: string;
  img: TfpgImage;
begin
  e := FFileList.Entry[ARow];
  if e = nil then
    Exit; //==>

  x := ARect.Left + 2;
  y := ARect.Top;// + 1;
  s := '';

  if (e.EntryType = etDir) and (ACol = 0) then
    Canvas.SetFont(HeaderFont)
  else
    Canvas.SetFont(Font);

  case ACol of
    0:  begin
          if e.EntryType = etDir then
            img := fpgImages.GetImage('stdimg.folder')          // Do NOT localize
          else if e.IsExecutable then
            img := fpgImages.GetImage('stdimg.executable')      // Do NOT localize
          else
            img := fpgImages.GetImage('stdimg.document');       // Do NOT localize

          if img <> nil then
            Canvas.DrawImage(ARect.Left + (picture_width - img.Width) div 2,
               y + (ARect.Height - img.Height) div 2, img);
          if e.IsLink then  // paint shortcut link symbol over existing image
            Canvas.DrawImage(ARect.Left+1, ARect.Top+1, fpgImages.GetImage('stdimg.link'));
          x := ARect.Left + picture_width;
          s := e.Name;
        end;
        
    1:  begin
          if e.EntryType = etDir then
            s := ''
          else
            s := FormatFloat('###,###,###,##0', e.Size);
          x := ARect.Right - Font.TextWidth(s) - 1;
          if x < (ARect.Left + 2) then
            x := ARect.Left + 2;
        end;

    2:  s := FormatDateTime('yyyy-mm-dd hh:nn', e.ModTime);

    3:  begin
          if FFileList.HasFileMode then // on unix
            s := e.Mode
          else                          // on windows
            s := e.Attributes;

          Canvas.SetFont(FixedFont);
        end;
  end;
  
  if FFileList.HasFileMode then // unix
    case ACol of
      4:  s := e.Owner;
      5:  s := e.Group;
    end;
  
  // centre text in row height
  y := y + ((DefaultRowHeight - Canvas.Font.Height) div 2);
  Canvas.DrawString(x, y, s);
end;

constructor TfpgFileGrid.Create(AOwner: TComponent);
begin
  FFileList := TfpgFileList.Create;
  inherited Create(AOwner);
  ColumnCount := 0;
  RowCount := 0;
  FFixedFont := fpgGetFont('Courier New-9');
  
  if FFileList.HasFileMode then
    AddColumn(rsName, 220)  // save space for file mode, owner and group
  else
    AddColumn(rsName, 320); // more space to filename

  AddColumn(rsSize, 80);
  AddColumn(rsFileModifiedTime, 108);
  
  if FFileList.HasFileMode then
  begin
    AddColumn(rsFileRights, 78);
    AddColumn(rsFileOwner, 54);
    AddColumn(rsFileGroup, 54);
  end
  else
    AddColumn(rsFileAttributes, 78);
    
  RowSelect := True;
  DefaultRowHeight := fpgImages.GetImage('stdimg.document').Height + 2;
end;

destructor TfpgFileGrid.Destroy;
begin
  OnRowChange := nil;
  FFixedFont.Free;
  FFileList.Free;
  inherited Destroy;
end;

function TfpgFileGrid.CurrentEntry: TFileEntry;
begin
  Result := FFileList.Entry[FocusRow];
end;

{ TfpgStringColumn }

constructor TfpgStringColumn.Create;
begin
  inherited Create;
  FCells := TStringList.Create;
end;

destructor TfpgStringColumn.Destroy;
begin
  FCells.Free;
  inherited Destroy;
end;

{ TfpgCustomStringGrid }

function TfpgCustomStringGrid.GetCell(ACol, ARow: Integer): string;
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  if ARow > RowCount-1 then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol]).Cells[ARow];
end;

function TfpgCustomStringGrid.GetColumnAlignment(ACol: Integer): TAlignment;
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol]).Alignment;
end;

function TfpgCustomStringGrid.GetColumnTitle(ACol: Integer): string;
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol]).Title;
end;

function TfpgCustomStringGrid.GetObjects(ACol, ARow: Integer): TObject;
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  if ARow > RowCount-1 then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol]).Cells.Objects[ARow];
end;

function TfpgCustomStringGrid.GetColumnWidth(ACol: Integer): integer;
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol]).Width;
end;

procedure TfpgCustomStringGrid.SetCell(ACol, ARow: Integer;
  const AValue: string);
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  if ARow > RowCount-1 then
    Exit; //==>
  if TfpgStringColumn(FColumns.Items[ACol]).Cells[ARow] <> AValue then
  begin
    BeginUpdate;
    TfpgStringColumn(FColumns.Items[ACol]).Cells[ARow] := AValue;
    EndUpdate;
  end;
end;

procedure TfpgCustomStringGrid.SetColumnAlignment(ACol: Integer;
  const AValue: TAlignment);
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  BeginUpdate;
  TfpgStringColumn(FColumns.Items[ACol]).Alignment := AValue;
  EndUpdate;
end;

procedure TfpgCustomStringGrid.SetColumnTitle(ACol: Integer; const AValue: string);
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  BeginUpdate;
  TfpgStringColumn(FColumns.Items[ACol]).Title := AValue;
  EndUpdate;
end;

procedure TfpgCustomStringGrid.SetObjects(ACol, ARow: Integer;
  const AValue: TObject);
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  if ARow > RowCount-1 then
    Exit; //==>
  TfpgStringColumn(FColumns.Items[ACol]).Cells.Objects[ARow] := AValue;
end;

procedure TfpgCustomStringGrid.SetColumnWidth(ACol: Integer; const AValue: integer);
begin
  if ACol > ColumnCount-1 then
    Exit; //==>
  BeginUpdate;
  TfpgStringColumn(FColumns.Items[ACol]).Width := AValue;
  EndUpdate;
end;

function TfpgCustomStringGrid.GetColumns(AIndex: Integer): TfpgStringColumn;
begin
  if (AIndex < 0) or (AIndex > ColumnCount-1) then
    Result := nil
  else
    Result := TfpgStringColumn(FColumns.Items[AIndex]);
end;

procedure TfpgCustomStringGrid.DoDeleteColumn(ACol: integer);
begin
  TfpgStringColumn(FColumns.Items[ACol]).Free;
  FColumns.Delete(ACol);
end;

procedure TfpgCustomStringGrid.DoSetRowCount(AValue: integer);
var
  diff: integer;
  c: integer;
begin
  inherited DoSetRowCount(AValue);
  if FColumns.Count = 0 then
    Exit; //==>

  diff := AValue - TfpgStringColumn(FColumns.Items[0]).Cells.Count;
  if diff > 0 then  // We need to add rows
  begin
    for c := 0 to FColumns.Count - 1 do
    begin
      while TfpgStringColumn(FColumns[c]).Cells.Count <> AValue do
        TfpgStringColumn(FColumns[c]).Cells.Append('');
    end;
  end;
end;

procedure TfpgCustomStringGrid.DoAfterAddColumn(ACol: integer);
var
  r: integer;
begin
  inherited DoAfterAddColumn(ACol);
  // initialize cells for existing rows
  for r := 0 to RowCount-1 do
    TfpgStringColumn(FColumns.Items[ACol]).Cells.Append('');
end;

function TfpgCustomStringGrid.DoCreateColumnClass: TfpgStringColumn;
begin
  Result := TfpgStringColumn.Create;
end;

procedure TfpgCustomStringGrid.DrawCell(ARow, ACol: Integer; ARect: TfpgRect;
    AFlags: TfpgGridDrawState);
var
  Flags: TFTextFlags;
  txt: string;
begin
  if Cells[ACol, ARow] <> '' then
  begin
    txt := Cells[ACol, ARow];
    Flags:= [];
    if not Enabled then
      Include(Flags,txtDisabled);

    case Columns[ACol].Alignment of
      taLeftJustify:
          Include(Flags,txtLeft);
      taCenter:
          Include(Flags,txtHCenter);
      taRightJustify:
          Include(Flags,txtRight);
    end;  { case }
    
    case Columns[ACol].Layout of
      tlTop:
          Include(Flags,txtTop);
      tlCenter:
          Include(Flags,txtVCenter);
      tlBottom:
          Include(Flags,txtBottom);
    end;  { case }

    with ARect,Columns[ACol] do
      Canvas.DrawText(Left+HMargin,Top,Right-Left-HMargin,Bottom-Top, txt, Flags);
  end;
end;

constructor TfpgCustomStringGrid.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ColumnCount := 0;
  RowCount := 0;
end;

function TfpgCustomStringGrid.AddColumn(ATitle: string; AWidth: integer;
    AAlignment: TAlignment; ABackgroundColor: TfpgColor; ATextColor: TfpgColor): TfpgStringColumn;
begin
  Updating;
  Result := TfpgStringColumn(inherited AddColumn(ATitle, AWidth));
  Result.Alignment := AAlignment;

  if ABackgroundColor = clDefault then
    Result.BackgroundColor := clBoxColor
  else
    Result.BackgroundColor:= ABackgroundColor;

  if ATextColor = clDefault then
    Result.TextColor := TextColor
  else
    Result.TextColor:= ATextColor;
    
  if UpdateCount = 0 then
    Updated;  // if we called .BeginUpdate then don't clear csUpdating here
end;

procedure TfpgCustomStringGrid.DeleteRow(AIndex: integer);
var
  c: integer;
begin
  inherited DeleteRow(AIndex);  // does sanity checks
  for c := 0 to FColumns.Count-1 do
  begin
    TfpgStringColumn(FColumns[c]).Cells.Delete(AIndex);
  end;
  FRowCount := FRowCount-1;
  if HasHandle then
    Update;
end;

end.